No Rev Limiter?

[rico05]

I just hit 10k RPM according to my HKS E-01 turbo timer?!? Discuss.

[biosehnsucht]

@!(%!()!!?!?!?!?!?

And you're sure its otherwise accurate?

have someone watch it while you drive and take it to like 2k, 3k, 4k, etc rpm on the tach and see if it reflects something resonably close??

could also be noise on the tach line caused it to pick up false tach readings..

[rico05]

Well, the tach shows a different figure than the E-01 but I was told here on NICO that the tach after so many years is off. But still, I have seen over 8k several times. I have also pegged the tach in the rain as well.

[rico05]

I should note that it was not under load. I missed a shift during a spirited drive. If that matters...

[biosehnsucht]

in that case it may be accurate.as in you revved in neutral or you mishifted into a lower gear ?

if in neutrel I'd guess you haven't got a revlimit. what ECU are you using?if mishifted to a lower gear, thats just what happens.

either way, if there's no immediate damage I wouldn't worry about it, but don't do it again :P

[rico05]

I tried to put it in second, but I didn't give enough cluth and it wouldn't go in gear. As far as I know it is a stock ECU.

[biosehnsucht]

Well this is why not to 'power shift'

If you have it floored in neutral its possible for it rev past the revlimit, especially if you were just in gear (still have boost and now no load) there may be enough force that despite the ECU cutting spark/fuel (I forget which, I think fuel) after x RPM it will still keep revving from the existing power it was making before the cut .. now if it would go that high I don't know..

when I say not to worry I mean not to worry because any damage done is done, nothing to do about it since you can't afford to juts rebuild it on the spur of the moment. doesn't mean the engine's fine

[rico05]

Well, it revvs fine and hold idle and gets on boost fine a pulls fine and all so I assume that everything is hunky dory. Drove it around all night long on a date and no problems so far.

[float_6969]

I think the stock tach is more accurate than you think. When I put my motor in, I had a friend that worked at Nissan that had ones of those external tach things and when he hooked it up to my tach signal, it was dead on with what the tach said. I'd trust the tach of the piggy back as it's not actully pulling from a tach signal, but from the fluctuations in the alternator.

[biosehnsucht]

Wait it measures RPM from battery voltage fluctuations ?! WTF!?

[rico05]

I know that is how the stock tach works on second generation RX-7 as well, so it does not surprise me. Regardsless, stock tach saw over 8000 RPM. So is there no rev limiter in neutral?

[float_6969]

I don't think so. I've mis-shifted a couple of times in neutral and it's never bounced off the revlimiter on me. But to be honest, to free rev like that in neutral isn't too big of a deal. There isn't any load on the motor anyway, so as long as your oil pump was still making pressure up that high, you should be fine.

[biosehnsucht]

I think its not so much there's no revlimit as that the ECU can't react quickly enough to how quickly it revs in neutral..

[float_6969]

well somebody needs to just go start thier car, warm it up, and then just stomp on it in Neutral and see what happens. Any takers?